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WikiPedia: NGC_300 http://annesastronomynews.com/photo-gallery-ii/gal... http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsear... http://www.cbat.eps.harvard.edu/lists/Supernovae.h... //arxiv.org/abs/0807.0606 //arxiv.org/abs/0903.1855 //arxiv.org/abs/astro-ph/0302045 //arxiv.org/abs/astro-ph/0510298 http://www.astronomerstelegram.org/?read=2640 //doi.org/10.1051%2F0004-6361:20030170 //doi.org/10.1051%2F0004-6361:20053475